Air compressor



.March 3l, 1931. R. p PESCARA 1,798,697v

AIR COMPRESSOR Filed March 24, 1921' 2 sheets-sheet 1 Y 1 l 5E- i 1 A 1g 19 x 3 20 13 11 l 11 L 16 6 15 2?- o' 28 L, A l 27 as*N 39 24 23 lSLW@ 35 3? 3s SW2 i: 5 31 33- 1 :sa

F, l 25- 112 2s 2s +o- 42 4 142 14o 29d ,7 3 ly l 9 L l f 11 /z asses/z//e/Io/t' AIR COMPRESSOR Filed March 24, 1927 2 Sheets-Sheet 2 @effPatented Mar. 31, 1931 UNITED STATES RAUL PATERAS PESCARA, F PARIS,FRANCE .AIR COMPRESSOR Application led March 24, 1927, Serial N'o.177,938, and in France April-1, 1926.

My invention relates to improvements in alr compressors of the type inwhich two direct driving pistons operatel in opposite directions.

The object of the invention is to provide a means for establishing theproper kinematic between the pistons and thus assure the synchronizingof said pistons, but at the same time not interfering with the propertransfer 1o of energy from said pistons.

My present invention is best suited for use with my two cycle directacting gas engine compressor claimed. and disclosed in my copendingapplication, Serial No. 181,553, filed April 6, 1927, but may beobviously utilized in any compressor where a synchronization of thedriving pistons is desired.

Brieiy outlined my invention consists in furnishing the two drivingpistons of the compressor with a plurality of rods parallel to theiraxes, adapting the ends of said rods to slide in suitable guidebearings, providing a rocker arm midway between the extremities of. saidrods and connecting the ends of said rocker arm to the ends of said rodsby links, thus assuring that when a piston moves ina given direction theother piston will move in the opposite direction and vice-versa.

Other objects of my invention will be obvious to those skilled in theart in the following specification taken in connection with theaccompanying drawing in which:

Fig. 1 is a vertical elevation of my apparatus, parts being shown insection, for purposes of clarity;

` Fig. 2 is a view similar to Fig. 1 in side elevation;

Fig. 3 is a view similar to Fig. 1 of a modiication conforming to thepresent invention;

O and Fig. 4 is a view similar to Fig. 2 of the modiication in Fig. 3.

Referring to the drawing and particularly Figs. 1 and 2, my aircompressor comprises a cylinder 5 furnished with two driving pistons 6and 7. The extremities of cylinder 5 are provided with and open into twolaterally extending cylinders 11 and 12 respectively, which are providedwith compressing pistons 13 and 14. Pistons 6 and 13 and 7 and 14areconnected together by means of piston rods 8 and 9 respectively. Eachpair of pistons may be made integral with its corresponding rod ifdesired. The mechanism for synchronizing the movement of each pair ofpistons with respect to the other pairwill now be described.

Rigidly secured to piston 13 are two rods 15 and 16. Piston 14 isfurnished with two similar rods 17 and 18. Rods 15l and 17 are disposedin the same longitudinal axis and parallel to the axis of theirrespective pistons. Corresponding rods 16 and-18 are disposed in likemanner. The rods 15 and 16 are attached to piston 13 in any convenientmanner at diametrically opposite points 19 and 20 cquidistance from thecenter of said piston on the idle or nonactive side of said'piston. Therods 17 and 18 are attached in like manner to piston 14 at points 21 and22. y

Said rods are provided with enlarged cylindrical portions 27, 28, 29 and30 respectively at their extremities and are adapted to slide in slottedguide bearings 23, 24, 25 and -26 in a direction parallel to themovement of members 27 and 35 and a second pair of links 40, 140 connectthe members 29 and 36. Similarly a pair of links 41, 141 and 42, 142eonneet the members 28, 37 and 30, 38 respectlvely. Thus the pistons'13and 14 are coupled together by means of the mechanism Just described andtheir rods 15, 16, 17 and 18.

A simple inspection of the mechanism disclosed in connection with Figs.1 land 2 will allow anyone skilled in the art to'which the deviceappertains to readily understand the function and purpose of the same.It will be sufficient to state that the mechanism thus far describedassures a synchronous relation betons 13, 6 and 14, 7. The particulararrangement and disposition of parts has the advantage that only a verysmall portion of the energy imparted to driving pistons 6, 7 is requiredto bring about the kinematic transformation between said pistons.

In the embodiment illustrated in Figs. 3 and 4, the guide-bearings 223,224, 225 and 226 are disposed side by side and parallel to each otherrather than in the same straight line as in tlie former embodiment. Therods 215 and 216, and 217 and 218 are likewise disposed side by side andparallel to each other instead of lying on the same longitudinal axis aspreviouslydescribed in connection with Figs. 1 and 2. The elements hereillustrated are precisely the same as before described and need not beexplained in detail. The reference numerals, with the exception of thoserelating to the compressor elements, per se, have all'beexi raised 200so as not to confuse them' with those of Figs. 1 and 2. In each case,however, similar numerals refer to like parts. It will be suliicient tostate that the embodiment set forth in Figs. 3 and 4 has the advantagethat the extremities 227, 228, 229 and 230 of rods 215, 216, 217 and 218can Vbe extended beyond trunnions 231 and 232 respectively whichpermits, in certain cases, the reduction of the longitudinal dimensionsof the air compressor proper.

Many variations in my apparatus may be made by those skilled in the artwithout dep arting from the spirit of my invention,

since What I claim is- 1. An air compressor' comprising a main drivingcylinder, driving pistons mounted i'n said cylinder, a compressingcylinder mountv ed at each extremity of said main cylinder,

compressin` pistons' mounted in lsaid--compressing cy inders, aplurality of rods carried by each of said compressing pistons disposedon the non-elective side thereof, guides at the extremities of saidrods, guide bearings for said guides and oscillatable synchronizingmeans interconnecting said guides.

2. An air compressor comprising a main driving cylinder, -drivingpistons mounted in said cylinder, a compressing cylinder mount-.

ed at each extremity of said main cylinder, compressing pistons mountedin said compressing cylinders, a. plurality of rods carried by each ofsaid compressing pistons disposed on the non-effective side thereof,guides at the extremities of said rods, guide bearings for said guides,a plurality of doublearmed'levers pivotally mounted on said maincylinder and oscillatable means connecting the extremities of saiddouble armed levers to said rods whereby movement of either piston ineither direction is transmitted to the other piston in the oppositedirection.

3. An air compressor. comprising a main driving cylinder, drivingpistons mounted in said cylinder, a compressing cylinder mounted at eachextremity of said main cylinder, compressing pistons mounted in saidcompressing cylinders, a plurality of rods carried by each of saidcompressing pistons disposed on the non-effective side thereof, guidesat the extremities of said rods, guide bearings for said guides, aplurality of trunnions fixed to the mid-point of said main cylinder', aplurality of double-armed levers pivoted on said trunnions at their midpoints and links connecting the extremities of said double armed leversto said rods whereby movement of either piston in either direction istransmitted to the other piston in the opposite direction.

4. An air compressor comprising a main driving cylinder, driving pistonsmounted in said cylinder, a compressing cylinder mounted at eachextremity of said main cylinder, compressing pistons mounted in saidcompressing cylinders, a plurality of rods on one of said compressingpistons disposed on the non-effective sidey thereof, a second pluralityof rods on the other of said compressing pistons di osed on thenon-effective, side thereof, slotte de bearings for said rods andoscillatable 'nematic transforming mechanism interconnecting said lirstand second mentioned rods.

5. An air compressor comprising a main driving cylinder, driving pistonsmounted in said cylinder, a compressin cylinder mounted at eachextremity of said main cylinder, compressing pistons mounted in saidcompressing cylinders, a plurality of rods on one of said compressingpistons disposed on the non-effective side thereof, a second pluralityof rods on theother of said compressing pistons disposed on thenon-elfectiveside thereof, slotted guide bearings for said rods,trunnions mounted between certain of said guide bearings, a plurality ofdouble armed levers pivoted on said trunnions and oscillatable

